miller



(N0 modem 2 SheetsSheet 1.

W. M. WOOD & JfC. MILLER.

AUTOMATIC MOTOR STOP. No. 561,846.

Patented June 9, 189

WITNESSES:

ATTORNEY.

ANN [GRAHAM mmummwnmnmu EC (No Model.) v 2 Sheets-Sheet 2. W. M. WOOD &J. O. MILLER.

AUTOMATIC MOTOR STOP.

No. 561,846. Patented June 9, 1 896 Qa/maa/ Cidfl i ATTOR/Vf).

WITNESSES:

ANO'REW BGRAHAM PM UTD-UTVIQWASN IN EIOIL IO UNITED STATES XVILLIAM M.FOOD AND JAMES C.

MILLER, on manna, new roan,

ASSIGNORS TO THE ELMIRA SAFETY APPLIANCE COllilPANY, OF

SAME PLACE.

AUTOMATIC MOTOR-STOP.

SPECIFICATION forming part of Letters Patent No. 561 ,846, dated June 9,1896.

Application filed October 21, 1895.

T0 at whom it may concern.-

Be it known that we, WILLIAM M. \VOOD and JAMES C). MILLER, citizens ofthe United States, residing at Elmira, in the county of Ghemung andState of New York, have invented new and useful Improvements inAutomatic Motor-Stops, of which the following is a specification.

The object of our invention is to preventa harmful increase in the speedof prime movers by automatically stopping the motor when it has attaineda predetermined speed; and we attain this object by means of a governorattached to the motor or to machinery driven by the motor, said governorbeing adapted to trip an electric-circuit closer, whereby when the speedis attained for which the governor is set an electric circuit iscompleted and a stop mechanism is set in motion.

For purposes of illustration in the accompanying drawings we have shownour invention as applied to a stationary steam-engine.

Figure 1 is a side elevation showing all the parts of our invention inoperative posit-ion. Fig. 2 is a detail in perspective showing the tripfor the circuit-closer. Fig. 3 is a vertical cross-section of: thestandard 0 in Fig. 1, showing the construction of the circuit-closer.Fig. 4 is a vertical cross-section of the top portion of the cylinder 11in Fig. 1, showing the weight for actuating the lever I and theretaining-armature Gr. Fig. 5 is a horizontal cross-section of thegovernor A in Fig. 1. Figs. (5 and 7 are side and end sectional views ofa different form of circuit-closer. Fig. 8 is a governor adapted for useon the arm of a flywheel or pulley. Fig. 9 is a different form ofweight-tripping mechanism adapted to be used in place of that shown inFig. 1.

Referring to Fig. 1, A is a governor attached to the outer end of thecrank-pin of aOorliss engine. B is the crank. C is a hollow standardcontaining the electric-circu it closer, and is adjustable vertically inthe base D. ires run from the circuit-closer to the battery F. andelectromagnets F, the latter attached to an upright fastened in thisinstance directly to the engine-frame. The magnets operate upon thearmature G, which in turn releases a weight within the tube H. Theweight in Serial No. 566,341. (No modelh dropping strikes the lever I,which throws up the latch J and releases the slide K, attached to whichis the heavyweight L. As the slide moves forward under the influence ofthe weight L it pulls on the chain connecting it with the lever M of thethrottle-valve and shuts off steam from the engine. The long arm of thelever I in descending is brought to rest by the stop N and at the sametime makes an electric circuit therewith to ring an alarm-gong on theopposite side of the upright. (Not shown.)

In resetting the apparatus the ci rcuit-closer in the standard O isfirst drawn up until engaged by its trip, then the weight in cylinderHis pulled up by the cord, to which is attached the handle 0, untilcaught by the armature G, and finally the slide K is pushed back untilthe latch J drops over its pin. This leaves the throttle-valve free tobe open ed and closed at the pleasure of the engineer.

In operation the governor A is thrown out at a predetermined speed ofthe engine, and aproj eetion therefrom strikes a trip to release thecircuit-closer. This trip and circuit-closer are shown in Figs. 2 and 3.A pin 1 is threaded into a T 3 at the end of the rod 2 and is adjustedand held fast therein by the head at and thumb-nut 5. Bars 7 projectfrom the cap 9 and support the rod 2, to which is fastened the pendentbar 6. A detent S'proj ects from the end of this bar and enteringthrough a slot in the tubular standard 0 engages a groove in the weight10 to hold said weight in elevated position. A rod 11 projects from thelower end of the weight 10 and is provided with a kuob,which,when theweight is tripped, strikes between the terminals 12 and establishes anelectric current to energize the magnets F. A diaphragm 13, ofinsulating material, is fastened in the tube C at the required heightand supports the terminals 12 and their respective bindingposts.Attached to the top of the weight 10 and projecting through the cap 9 isa rod ll to be used in resetting the circuit-closer. A spring 15 is inserted between the cap and top of weight to cause the weight to actquickly and also to prevent it from sticking.

Fig. 4 shows a cross-section of the top of the tube II, in which islocated and guided the weight 16, which drops upon and actuates thelever I. A detent 17 on the armature G projects through a slot in thetube II and into a groove in the weight 16. A cord 20 is attached to theweight and runs over a pulley 19, held upon the cap 18, the free end ofthe cord being fastened to the hand-pull O. A spring may be insertedbetween the weight 16 and cap 18 similar to the spring 15.

The governor A is shown in longitudinal cross-section in Fig. 5. Theweight 21 slides upon the rod 22, attached to the plate 23, which inturn is held upon the end of the crank-pin 24 by the cap-screw 25. Pins26 project from the plate and enter correspond in g holes drilled in thecrank-pin to prevent the plate from turning. The rod 22 is provided witha head 28, which fits 'a correspond ing bore in the centerof the weight21, a spring 27 being inserted between the head and the bottom of thebore. The rod 22 is squared and enters the here through a square hole inthe weight, thus preventing the weight from turning. The outer end ofthe bore is screwthreaded and plug 29 is screwed thereinto, the tensionof the spring and the speed at which the governor acts being regulatedthereby. The head of this plug is flattened at 30 and strikes the pin 1of the circuit-closer trip when the weight 21 is thrown out by centrifugal force. The j am-nut 31 holds the plug as set.

In Figs. 6, 7, and 8 is shown a different form of governor andcircuit-closer without departing in any way from the spirit of ourinvention, and this form of governor and circuit-closer can be usedindiiferently in connection with the circuit-closer and governor alreadydescribed. The governor to when thrown out by centrifugal force causes aprojection 47 to come in contact with the end of a trip 32, whichreleases a circuit-closer in the box b,attached to the standard 0.Through the box Z) passes a rod 33, provided with a notch to receive ad'etent on the trip 32. This trip is pivoted to the box near the rod 33,and a spring runs from the box to the free end of the trip to hold thedetent on the trip in the notch on the rod. The rod 33 is provided withheads at its ends, and a spring 34 is inserted between the lower headand the box to force the rod downward when the trip is thrown out. A pin35 on the rod engages a slotted bar 36, which is pivoted to a pin fromthe binding-post 41. The bar 36 in its downward movement rubs againstthe contactplate 37, attached to a second binding-post 42, thusestablishing an electric circuit. In order to reset the circuitcloser,the arm 38 is turned up against the arm 39, projecting from the rod 33,until the rod is lifted far enough for the detent to spring into itsnotch. The arm 38 is keyed to the end of a shaft 45, extending throughthe projection 43 on the box h, and a crank 46 is fastened to the otherend of the shaft for operating it. The projection 43 is adjustablelongitudinally in a T at the top of the standard 0, which in turn isadjustable vertically in a base, as shown at D in Fig. 1. I

The box I) may also be turned in the T, so that by means of these adjustments the trip may readily be brought into position to be struck bythe governor.

The governor shown in Fig. 8 comprises a strap or bracket 51, attachedto the spoke of a fly-wheel or pulley, an arm 49, pivoted thereto at50,and a weight adjustable longitudinally at one end of the arm. Thisweight is provided with the pin 47, projecting therefrom, as alreadyreferred to. An adjustable stop 53 prevents the weight from droppingtoward the shaft. A circular guide 52, fastened to the strap 51,prevents side motion of the governor-weight. Springs 54 and 55 hold thearm against the stop 53 and act against the weight. In adjusting thegovernor for different speeds the weight is shifted upon the arm and thetension of the springs changed as required. An indicator 56 is providedto show the position of the governor-weight when the engine has been runat the speed at which the trip is to be struck. This position beingascertained the trip 32 may be readily located so as to be struck at theproper time.

Fig. 9 shows a modification of the weight releasing mechanism. Here themagnets to actuate an armature 61 to withdraw a detent thereon from anotch in the weight 62. This weight is attached to the end of a flatspring 63, pivoted at 64 and bent against a pin 05. The weight indescending strikes against the free end of a bell-crank lever 66,pivoted at 67 and provided with a pin 68 on its depending arm. Restingupon the pin 68 is a pin 69, projecting from the arm 70, the centers ofthe two pins being in a vertical line. The arm 70 is pivoted at 71 andprovided at its free end with a heavy weight 72, from which runs a chainover the pulley 73 to actuate the lever of a throttle-valve or othershut-off. A cord from the weight 62 runs over a pul ley 75 and isattached to a pull 7 4 for reset-- ting the apparatus.

We have shown the weight-tripping mechanism attached to the frame of anengine, as this renders the whole apparatus compact and out of the way;but it is evident that the frames of many engines cannot be utilized inthis way and that other species of motors will require a differentlocation of this tripping mechanism. In applying our invention todifferent motors in different locations many changes in governor,circuit-closer, and stop mechanism and in their location will ofnecessity have to be made, without, however, departing from the spiritof our invention, and we therefore do not wish to be understood aslimiting ourselves in any way to the specific mechanisms shown.

We are aware that we are not the first to employ governors incombination with electric-circuit closers to operate stop mechanisms,and we do not therefore claim such a combination broadly.

What we do claim as our invention, and desire to secure by LettersPatent, is-

1. In an automatic motor-stop, in combination, a governor, tripmechanism in position to be struck when the governor is actuated byundue speed in the motor, an electriecircuit closer retained by the tripmechanism, and a stop mechanism controlled by the electric circuit.

2. In an automatic motor-stop, in combination, a governor comprising anadjustable weight controlled by an adjustable spring and provided with aprojection, a trip device in line with said projection when the governoris actuated by undue speed of the motor, a circuit-closer operated bysaid trip device,and a stop mechanism set in motion by the electriccurrent so established.

In an automatic motor-stop, a governor consisting of a plate attached toa rotating part,a rod extending from said plate, a weight slidable uponsaid rod, a spring opposing the movement of the weight upon the rod, andmeans for adjusting the tension of the spring, in combination with atrip device adapted to be struck by the governor-weight when thegovernor is actuated by undue speed of the motor, and mechanism releasedby said trip device to stop the motor, substantially as described.

l. In an automatic motor-stop, a governor consisting of a plate attachedto a rotating part, a rod extending radially outward from said plate,aweight slidable upon said rod, a head on the rod fitting a bore in theweight, a spring between the head and the bottom of the bore, a plugscrew-threaded into the end of the bore and abutting against the head onthe rod, and means for turning the plug and fastening it in place toadjust the tension of the spring, in combination with a stop mech-,anism adapted to be set in motion by the governor when actuated by unduespeed of the motor.

5. In an automatic motor-stop, a trip device consisting of a rod pivotedin a suitable support, a bar pendent from said rod and provided with adetent, an adjustable pin in the free end of the rod, and means forfastening the pin in proper adjustment to be struck by a governor whenactuated by undue speed of the motor, substantially as described.

6. In an automatic motor-stop, a circuitcloser consisting of aprotective case, a trip device supported thereby, a movable memberguided in the case, a notch in said member to receive a detent on thetrip device, terminals of an electric circuit within the case adapted tobe brought into connection by said movable member when released, andmeans for resetting the circuit-closer, substantially as described.

7. In an automatic motor-stop, a circuitcloser consisting of anadjustable tubular standard, a cap to said standard, a trip devicesupported by said cap, a weight within the standard held by a detent onthe trip device, terminals of an electric circuit supported below theweight, a knob attached to the weight adapted to strike the terminalswhen the weight is dropped, and a rod attached to the top of the weightand passing through the cap for resetting the circuit-closer.

8. In a stop mechanism, in combination, a weight connected to anoperating-lever, a catch to hold said weight suspended, a lever foroperating said catch, a small weight adapted to strike upon the free endof said lever, and an electromagnet having an armature provided with adetent for holding the small weight in elevated position while themagnet is quiescent, substantially as described.

9. In a stop mechanism, in combination, a slide connected to anoperating-lever, guides for the slide, a weight attached to the slide, alatch from the slide adapted to catch upon a pin, a lever for throwingthe latch, a small weight held by a detent over the free end of saidlever, a guide for said weight, and an electromagnet for operating thearmature to which the detent is attached, substantially as described.

10. In a stop mechanism, in combination, a weight connected to anoperating-lever, a catch to hold said weight suspended, a lever foroperating said catch, a small weight adapted to strike upon the free endof said lever, a spring for actuating said weight, and an electromagnethaving an armature provided with a detent for holding the small weightirrelevated position while the magnet is quiescent, substantially asdescribed.

I WILLIAM M. WOOD.

JAMES C. MILLER. Witnesses J on H. Guns, Units. J. MAYO.

